timeside/analyzer/aubio_pitch.py: add mean and median, use container
tests/api/examples.py: remove old FixedInputProcessor
tests/api/test_analyzer.py: update
tests/listprocessors.py: update
./tests/test_AnalyzerResult.py: comment out float16, not implemented in numpy <= 1.4
timeside/analyzer/aubio_specdesc.py: add spectral descriptors